[Gluster-users] Gluster 3.2.0 and ucarp not working

[Joe Landman]

On 06/08/2011 04:37 PM, Joshua Baker-LePain wrote:

>> BTW: You need a virtual ip for ucarp
>
> As I said, that's what I'm doing now -- using the virtual IP address
> managed by ucarp in my fstab line. But Craig Carl from Gluster told the
> OP in this thread specifically to mount using the real IP address of a
> server when using the GlusterFS client, *not* to use the ucarp VIP.
>
> So I'm officially confused.

GlusterFS client side gets its config from the server, and makes 
connections to each server.  Any of the GlusterFS servers may be used 
for the mount, and the client will connect to all of them.  If one of 
the servers goes away, and you have a replicated or HA setup, you 
shouldn't see any client side issues.

GlusterFS using an NFS client presents a mount point, and a single point 
of connection to the server.  Any of the GlusterFS servers may be used 
for the mount, and the client will connect to all of them.  If one of 
the servers goes away, and you have a replicated or HA setup, you 
shouldn't see any client side issues if you are not attached to that 
server for your mount.  Otherwise, the mount may hang.

Does this make it clearer or less so?

ucarp would be needed for the NFS side of the equation.  round robin DNS 
is useful in both cases.






-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
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